The 2001 LHS shares the LH platform with the 300M and Concorde, featuring Chrysler's 3.5L V6 and the 42LE four-speed automatic. While comfortable and spacious, this generation suffers from catastrophic engine failures and transmission cooling issues that can total the car if ignored.
3.5L Engine Sludge and Catastrophic Failure
Common · high severityTypical onset: 80,000-140,000 mi
Symptoms: knocking or ticking from lower engine, sudden loss of oil pressure, seized engine with no warning, metal shavings in oil, cloud of blue smoke on startup
Fix: The 3.5L is notorious for sludge buildup that starves rod bearings, leading to spun bearings and crankshaft damage. If caught early (bearing noise), you're looking at a bottom-end rebuild with new bearings, possibly crank machining—12-16 labor hours. Most cases result in full engine replacement or short block swap at 18-24 hours because owners ignore the knock until it's catastrophic.
Estimated cost: $3,500-6,500
42LE Transmission Cooler Line Failure and Fluid Cross-Contamination
Common · high severityTypical onset: 70,000-120,000 mi
Symptoms: transmission slipping or delayed engagement, milky pink fluid in coolant reservoir, overheating transmission, coolant in transmission pan, sudden transmission failure after overheating
Fix: The internal transmission cooler in the radiator develops pinhole leaks, allowing coolant and ATF to mix—this kills the transmission within days. Requires radiator replacement, full transmission fluid flush (sometimes requires dropping pan and cleaning valve body), new cooler lines—4-6 hours if caught immediately. If contamination sat for any time, add transmission rebuild or replacement at 12-18 hours total.
Estimated cost: $800-1,200 (caught early); $2,800-4,500 (trans damaged)
Transmission Mount Failure
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: heavy clunk when shifting from Park to Drive or Reverse, visible engine rocking during acceleration, vibration at idle, transmission noise increases with load
Fix: The front transmission mount (also supports engine) deteriorates and tears, allowing excessive drivetrain movement. Replacement requires supporting the engine/trans assembly and often coincides with replacing both front and rear mounts for longevity—3-4 hours labor for both mounts.
Estimated cost: $400-650
Crankshaft Position Sensor No-Start
Occasional · high severityTypical onset: 90,000-150,000 mi
Symptoms: intermittent no-start, cranks but won't fire, stalling while driving, usually when hot, dies and restarts after cooling 20-30 minutes, no check engine light in some cases
Fix: The crank sensor fails due to heat exposure and gives intermittent signal loss. Located behind the engine near the flexplate—tight access from underneath. Replacement is 1.5-2 hours if you can get it without removing other components; some techs drop the starter for access.
Estimated cost: $250-400
Water Pump and Timing Belt Service Neglect
Occasional · high severityTypical onset: 90,000-110,000 mi
Symptoms: coolant weeping from weep hole on water pump, squealing from front of engine, overheating, coolant loss with no visible external leak
Fix: This is an interference engine—if the timing belt snaps, valves meet pistons and you're into head work or total engine replacement. The 3.5L timing belt interval is 105k miles but many owners skip it. Water pump is driven by timing belt and should be replaced simultaneously. Full timing belt kit with water pump, tensioner, and seals is 4-5 hours labor.
Estimated cost: $650-950
Blend Door Actuator and HVAC Control Failure
Occasional · low severityTypical onset: 80,000-130,000 mi
Symptoms: clicking or ticking from behind dash, no heat on one side or both sides, air only blows hot or only cold regardless of setting, temperature fluctuates randomly
Fix: The blend door actuators (multiple in this car) strip gears or seize. Requires partial dash disassembly to access—labor ranges from 2-4 hours depending on which actuator fails. Some techs access through glove box removal for passenger side, but driver side is deeper.
Estimated cost: $300-600
Front Sway Bar Links and Bushings
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: clunking over bumps at low speed, rattling from front suspension on rough roads, noise goes away when turning
Fix: Sway bar end links and frame bushings wear out predictably. Links are quick (0.8 hour), bushings require dropping the sway bar (1.5 hours for both sides). Replacing links and bushings together makes sense—2 hours total.
Estimated cost: $250-400
Only buy if full service records prove religious oil changes and timing belt service—otherwise it's a $4,000 engine failure waiting to happen, and even good ones are on borrowed time.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.